package com.hui.ruiji.filter;

import com.alibaba.fastjson.JSON;
import com.hui.ruiji.common.BaseContext;
import com.hui.ruiji.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经登录
 */

@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求的url
        String uri = request.getRequestURI();

        log.info("拦截到请求路径:{}", uri);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };

        //2.是否要处理本次请求
        Boolean res = check(uri, urls);

        //3.不需要处理，放行
        if (res) {
            log.info("不需要处理:{}", uri);
            filterChain.doFilter(request, response);
            return;
        }

        //4.需要处理,判断是否登录了  登录了,直接放行
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录,用户ID为:{}", request.getSession().getAttribute("employee"));
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request, response);
            return;
        }

        //4.21 需要处理,判断是否登录了  登录了,直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录,用户ID为:{}", request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;
        }

        //5.没登录返回登录结果，通过输出流方式向客户端页面响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 判断本次请求是否需要放行
     *
     * @param uri
     * @return
     */
    public Boolean check(String uri, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, uri);
            if (match) {
                return true;
            }
        }
        return false;
    }
}
